02-19-2012, 03:54 PM
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CC Member
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Join Date: Apr 2004
Location: Scotts Valley,
CA
Cobra Make, Engine: ERA 289 FIA #2108
Posts: 1,882
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Quote:
Originally Posted by 4pipes
Backfiring is detonation up out of the carburetor. Do you mean unburned gas is detonating in the exhaust pipes? I had a stuck needle valve (float) that caused that on a Holley.
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Unburnt fuel detonating in the exhaust pipe is what I meant when I wrote "backfiring".
Looked at the timing, and at 2000 rpm the timing is advanced 32 degees.
Looked at the float levels through the "windows" (actually, screws on my carb) and it didn't seem too high. Unset and reset the idle/mixture screw to see if any debris could be knocked loose. Rotated the choke with no change in rpm.
Baffled. Hmmm, let's see, needle valve...
DD
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